I didn't see any activity around the bucket last night or this morning, so I checked it out, and they have fledged.
They got out of the pail just fine I guess. I really wanted to see them when they took off, but I missed it. I did see a pair of swallows with three juveniles on the electric wire, I have no idea if that was them, but I'd like to think it was. It's good to know that I have another option to save the little ones that fall out of the nest in the future though.